J/MNRAS/431/2917ivo://CDS.VizieR/J/MNRAS/431/2917doi:10.26093/cds/vizier.74312917CDSde Grijs R.Anders P.Zackrisson E.Ostlin G.2024-07-21T20:14:49Z2014-07-10T15:20:30ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesstellar-associationsUsing high-resolution Hubble Space Telescope data, we re-examine the fundamental properties (ages, masses and extinction values) of the rich star cluster population in the dwarf starburst galaxy NGC 5253. The gain in resolution compared to previous studies is of order a factor of 2 in both spatial dimensions, while our accessible wavelength range transcends previous studies by incorporation of both near-ultraviolet and near-infrared (IR) passbands. We apply spectral synthesis treatments based on two different simple stellar population model suites to our set of medium-, broad-band and H{alpha} images to gain an improved physical understanding of the IR-excess flux found for a subset of young clusters (30 of 149). With the caveat that our models are based on fully sampled stellar mass functions, the NGC 5253 cluster population is dominated by a significant number of relatively low-mass (M_cl_<~ a few x10^4^M_{sun}_) objects with ages ranging from a few x10^6^ to a few x10^7^yr, which is in excellent agreement with the starburst age of the host galaxy. The IR-excess clusters are almost all found in this young age range and have masses of up to a few x10^4^M{sun}. The IR excess in the relatively low-mass NGC 5253 clusters is most likely caused by a combination of stochastic sampling effects and colour variations due to the presence of either luminous red or pre-main-sequence stars. We also find a small number of intermediate-age (~1Gyr old), ~10^5^M{sun} clusters, as well as up to a dozen massive, ~10Gyr old globular clusters. Their presence supports the notion that NGC 5253 is a very active galaxy that has undergone multiple episodes of star cluster formation.2013MNRAS.431.2917Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/431/2917CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/603/503 : HST photometry in NGC 5253 and NGC 3077 (Harris+, 2004)J/ApJ/656/168 : Spectrophotometry in NGC 5253 (Lopez-Sanchez+, 2007)J/A+A/550/A88 : Data cubes of NGC 5253 (476-682nm) (Westmoquette+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/431/2917https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/431/2917http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/431/2917https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/431/2917https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/431/2917http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/431/2917GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/431/2917/table23 (NGC 5253 cluster coordinates and derived parameters assuming fully sampled YGGDRASIL (Zackrisson et al. 2011ApJ...740...13Z, table2) and GALEV (Kotulla et al. 2009MNRAS.396..462K, table3) SSP models)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/431/2917/table23?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/431/2917/table23?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/431/2917/table23?GETtext/xml+votable180.050000true204.97660611-31.642696390.0055555555555555566/43874https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/431/2917?format=asciidefaultJ/MNRAS/431/2917/table23NGC 5253 cluster coordinates and derived parameters assuming fully sampled YGGDRASIL (Zackrisson et al. 2011ApJ...740...13Z, table2) and GALEV (Kotulla et al. 2009MNRAS.396..462K, table3) SSP modelsID[0/182] Cluster identification numbermeta.id;phys.atmol.number;meta.mainintprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSizeGaussian sigma {sigma}_G_(F550M)pixstat.stdevfloatNf[7/10]? Number of filters used to obtain the derived parametersmeta.numberintnullablelogt1[6.0/10.2]? log of the best age (YGGDRASIL)log(yr)time.age;meta.modelledfloatnullableE_logt1? Error on logt (upper value)log(yr)stat.error;stat.maxfloatnullablee_logt1? Error on logt (lower value)log(yr)stat.errorfloatnullablelogM1[2.4/5.7]? log of the best mass (YGGDRASIL)log(solMass)phys.massfloatnullableE_logM1? Error on logM (upper value)log(solMass)stat.error;stat.maxfloatnullablee_logM1? Error on logM (lower value)log(solMass)stat.errorfloatnullablelogt2[6.6/10.1]? log of the best age (GALEV)log(yr)time.age;meta.modelledfloatnullableE_logt2? Error on logt2 (upper value)log(yr)stat.error;stat.maxfloatnullablee_logt2? Error on logt2 (lower value)log(yr)stat.errorfloatnullablelogM2[2.3/5.0]? log of the best mass (GALEV)log(solMass)phys.massfloatnullableE_logM2? Error on logM2 (upper value)log(solMass)stat.error;stat.maxfloatnullablee_logM2? Error on logM2 (lower value)log(solMass)stat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar